Load Far Pointer, LFS Instruction

[baltoro]

I'm just learning assembly language programming, and I ran across this instruction in the Intel Developer's Manuals.
LFS, reads and stores the far pointer specified by the source memory operand into the FS segment register.
Would you ever use this instruction in User Mode? Why?
The documentation doesn't say its usage is restricted to kernel mode (operating system) applications only. 
I'm strictly a Windows programmer, and I'm having a difficult time imagining when it would be useful, except in malicious code.   
And, normally, how is the FS segment register loaded? Doesn't the operating system control this?

[hutch--]

Generally instructions of this type are for operating system development and have no use in user code. If you were writing a haooby OS you would have a reason to learn it but in win32 user mode, its a waste of your time.

[Tedd]

Most modern (32-bit) operating systems reserve the segment registers for their own use, and so there's not much value in changing them from user mode. And, unless you know what you're doing, you're likely to attempt to load an invalid selector and cause an exception in your program.
You can safely ignore these instructions (LDS, LES, LFS, LGS, LSS) for normal use (of course, be aware they exist, but they're not much use to you for general programming.) And when segment registers are required, it's more common to load them directly.

[baltoro]

Tedd and Hutch,   
Thanks. Good Intel. I couldn't find any useful information by googling, so I figured I'd ask here.